When you view a black and white vertical grating with a natural density filter on one eye, it looks like a set of white slats. It will appear as if they are slanted along a vertical axis. You will see it nearer with the eye that has the filter. Moreover, when you look at gratings of different frequencies with both your eyes, it appears that there are several local slanted regions. One would expect it to slant as a whole. But therein lies the twist. It is quite an interesting phenomenon and calls for a thorough investigation.

It happens when the spatial frequencies are different in both the eyes. If you cross-correlate the images, many correlation peaks will appear. Is it the disparity estimate that is the primary reason for the depth perceived by the viewer? We are yet to find an answer.

What Is Special About Venetian Blinds?

The popularity of Venetian blinds has grown by leaps and bounds over the years. They are the best way to cover windows that have problems with the fittings. They consist of horizontal slats. You can tilt, raise, or lower them according to your convenience. Now control the amount of light you want in your room with ease.

These blinds came into being way back in 1794. With the growth in their popularity, wooden blinds took a backseat. They also took the place o0f curtains and shutters. Fabric curtains will either let all the light enter the room or will keep it completely dark. It gives you no option to control the amount of light according to your wish. As you have already guessed from the name, they originated in Venice, Italy.

Now, there are two types of disparity trends- minimum absolute nad minimum relative. The former seeks to reduce the absolute disparity of the features of the image. On the other hand, the latter aims to reduce the relative disparity of the features of the image. According to the minimum relative disparity rule, the viewer should see a single slant. However, they see a series of planes along a central axis. It is therefore supported by the minimum absolute disparity theory. But there is a great deal of confusion. It is not clear if this weighting function depends on disparity or the slant. The viewers can only get awestruck by the visual effect.

The question that arises is whether there is a preference for zero-disparity or zero-slant.

Preference For Zero Disparity

Research shows that binocular neurons prefer zero disparity. There are many models of disparity. However, the visual cortex has a bias for disparity near zero. It occurs because the visual cortex has a leaning towards stimuli near the horopter.

Preference For Zero Slant

Zero slant preference has a geometric basis. When a viewer looks at numerous small objects, the area of the retinal image is maximised if the slant is zero. Have you ever seen the sun rays through the clouds? Don’t they appear like a fan? However, they are all parallel rays. After all, they are coming from the same source. It is be4cause of the sunbeam illusion that you perceive them in that way. Their slant seems like zero.

Final Word

Now that you have obtained an idea about the technicalities, it is time to get your window blinds. You have several options for roller blinds in Delhi. However, Venetian blinds are the best. After all, what else will offer you the same flexibility? Adjust the light according to your mood. Forget all your worries when you have your window blinds from Mac. So, why are you waiting? Go and get your windows dressed today without further delay.